West Africa has been experiencing the devastating Ebola outbreak since February 2014. There are 26,000 cases including over 10,000 deaths from 10 countries in this outbreak. I, the speaker, was deployed to Liberia, which is one of the countries most affected by the outbreak, for 3 months as a WHO consultant. From the experience, I would like to discuss what Ebola is, how and why the infections spread so widely in the outbreak, and what we can and should do as a member of international society.